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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# pylint: disable=C,R,W
from superset.db_engine_specs.base import BaseEngineSpec


class AthenaEngineSpec(BaseEngineSpec):
    engine = 'awsathena'

    time_grain_functions = {
        None: '{col}',
        'PT1S': "date_trunc('second', CAST({col} AS TIMESTAMP))",
        'PT1M': "date_trunc('minute', CAST({col} AS TIMESTAMP))",
        'PT1H': "date_trunc('hour', CAST({col} AS TIMESTAMP))",
        'P1D': "date_trunc('day', CAST({col} AS TIMESTAMP))",
        'P1W': "date_trunc('week', CAST({col} AS TIMESTAMP))",
        'P1M': "date_trunc('month', CAST({col} AS TIMESTAMP))",
        'P0.25Y': "date_trunc('quarter', CAST({col} AS TIMESTAMP))",
        'P1Y': "date_trunc('year', CAST({col} AS TIMESTAMP))",
        'P1W/1970-01-03T00:00:00Z': "date_add('day', 5, date_trunc('week', \
                                    date_add('day', 1, CAST({col} AS TIMESTAMP))))",
        '1969-12-28T00:00:00Z/P1W': "date_add('day', -1, date_trunc('week', \
                                    date_add('day', 1, CAST({col} AS TIMESTAMP))))",
    }

    @classmethod
    def convert_dttm(cls, target_type, dttm):
        tt = target_type.upper()
        if tt == 'DATE':
            return "from_iso8601_date('{}')".format(dttm.isoformat()[:10])
        if tt == 'TIMESTAMP':
            return "from_iso8601_timestamp('{}')".format(dttm.isoformat())
        return ("CAST ('{}' AS TIMESTAMP)"
                .format(dttm.strftime('%Y-%m-%d %H:%M:%S')))

    @classmethod
    def epoch_to_dttm(cls):
        return 'from_unixtime({col})'

    @staticmethod
    def mutate_label(label):
        """
        Athena only supports lowercase column names and aliases.
        :param str label: Original label which might include uppercase letters
        :return: String that is supported by the database
        """
        return label.lower()
